The medium of a wave is
a. the middle point of the wave
b. what the wave is traveling through
c. where the average position of the wave is located
d. a dashed line indicating the resting position of the wave

B. A medium of the earth’s atmosphere is why we can hear sound. In space, you wouldn’t have an atmosphere or or any kind of medium for sound waves to travel through, which is why you wouldn’t be able to hear sound in space

Ibelieve the correct answer would be c.

Honestly "global warming" may be a slight possiblity, however they called it "climate change" because its not real, in fact we had one of our coldest days here not too long ago, and the "issues" with this subject is a blindfold for actual problems.